1,Type:Circular,square,elliptic manhole covers,sanitary manhole cover,sanitary grade ... stainless steel manhole,man way) 1,Type:Circular,square,elliptic 2,With pressure or without pressure 3,Material quality:AISI304,AISI316LFineness ... grade manhole cover NameSanitary manhole coverNo.SHSD-MC03MaterialAISI304,AISI316LTypeCircular,square,ellipiticFinenessInner surface mechnical polish Ra<0.4-0.8um, ...